#pragma once

#include "icmp.h"


struct icmp_client_incoming {
	const uint8_t *data;  // points to internal buffer
	size_t length;  // length of 'data'

	int id, seqnum;
};

// Returns -1 on error with errno.
int icmp_client_open_socket(void);

// Only actual IPv4 addresses allowed. Sends data in 'data' with length 'length', and
// returns pointer to internal buffer with reply data. Buffer is invalidated on next
// call to the function.
// Returns {.data=NULL} on error with errno.
struct icmp_client_incoming icmp_client_communicate(
		int sock, const char *ip_address,
		int id, int seqnum,
		const void *data, size_t length);